3M 4941

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Description for 3M 4941

• Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C

*See Terms of Use Below

Chemical Resistance	Chemical Resistance: Excellent solvent resistance, Chemical Resistance: Very good plasticizer resistance
Application Type	Bond
1 Part or 2 Part	1-Part
Material Form	Tape
Substrate	Acrylic paint, Aluminum, Ceramic, Glass, Metal, Plastics, Polycarbonate, Polyester paint, Polyurethane paint, PVC, Enameled Steel, Stainless steel, Nickel Coated ABS, Plasticized Vinyl, Galvanized Steel, Epoxy, Galvanized Steel, PBT, Foam, ABS, Painted Metals, Nickel Coated ABS
Industry	Human Machine Interface, Rivets
Manufacturer	3M
Chemistry	Acrylic
Cure Method	Pressure sensitive
Application Temperature (°F)	59, 70 to 100
Color	Gray
High Temperature Resistance (°C)	110, 75, 90, High
Low Temperature Resistance (°C)	-35
Volume Resistivity (O)	2.1e14 (ohms/cm)
Density (g/cm³)	0.720
Key Specifications	UL 746C

Best Practices for 3M 4941

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Technical Data for 3M 4941

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Overview

Chemical Resistance
- Chemical Resistance : Relative Solvent Resistance - Excellent solvent resistance
- Chemical Resistance : Plasticizer Resistance - Very good plasticizer resistance
Application Type
- Adhesive - Bond
1 Part or 2 Part
- 1-Part
Material Form
- Tape
Substrate
- Ceramic
- Foam
- Glass
- Metal - Painted Metals
- Aluminum
- Steel - Enameled Steel
- Nickel - Nickel Coated ABS
- Galvanized - Galvanized Steel
- Plastic - Plastics
- Acrylic (PMMA) - Acrylic paint
- Polycarbonate
- Polyurethane - Polyurethane paint
- Polyvinyl chloride (PVC) - PVC
- Vinyl - Plasticized Vinyl
- Epoxy
- ABS - Nickel Coated ABS
- Polyester - Polyester paint
- Polybutylene Terephthalate (PBT) - PBT
- Stainless Steel
- Galvanized Steel
- Other - Paint
Industry
- Rivet - Rivets
- Human Machine Interface
- Industrial - Fasteners, Foils, Spot Welds
- Construction
Chemistry
- Acrylic
Cure Method
- Pressure Sensitive (min) - Pressure sensitive
Color
- Gray
Key Specifications
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL 746C

Specifications

Cure Specs

Application Temperature (°F)	59, 70 to 100

Bond Strength

General Bond Strength (psi)	Good
Peel Strength (piw)	High
Shear Strength (psi)	High
Tensile Strength (psi)	High

Material Resistance

High Temperature Resistance (°C)	110, 75, 90, High
Low Temperature Resistance (°C)	-35
Moisture/Humidity Resistance	Excellent

Conductivity

Dissipation Factor	0.02450, 0.03740	Test Method
Dielectric Strength (V/mil)	360	Test Method
Dielectric Constant	2.29, 1.99	Test Method
Thermal Conductivity (W/m°K)	0.08, 0.92	Test Method
Surface Resistivity (O)	2.7e14 (ohms/sq.)
Volume Resistivity (O)	2.1e14 (ohms/cm)	Test Method

Hardness

Flexibility	Conformal
Modulus (psi)	3e5 (Pa)	Test Method

Other Properties

Coefficient of Thermal Expansion (CTE)	180e-6 (m/m/°C)
Density (g/cm³)	0.720

Business Information

Shelf Life Details	All 3M™ VHB™ Tapes have a shelf life of 24 months from date of shipment when stored at 40°F to 100°F (4°C to 38°C) and 0-95% relative humidity. The optimum storage conditions are 72°F (22°C) and 50% relative humidity. Performance of tapes is not projected to change even after shelf life expires, however, 3M does suggest that 3M™ VHB™ Tapes are used prior to the shelf life date whenever possible.
Shelf Life Temperature (°F)	39 to 100
Shelf Life Type	From date of shipment
Shelf Life (mon)	24

Best Practices for 3M 4941

*See Terms of Use Below
1. Surface Preparation
  
  Most substrates are best prepared by cleaning with a 50:50 mixture of isopropyl alcohol (IPA*) and water prior to applying 3M™ VHB™ Tapes.
  
  See Vendor Technical Data Sheet for more info.
  
  To obtain good performance with all 3M™ VHB™ Tapes, it is important to ensure that the surfaces are dry and free of condensed moisture.
2. Application
  
  Bond strength is dependent upon the amount of adhesive-to-surface contact developed. Firm application pressure develops better adhesive contact and helps improve bond strength. Typically, good surface contact can be attained by applying enough pressure to insure that the tape experiences approximately 15 psi (100 kPa) pressure. Either roller or platen pressure can be used. Note that rigid surfaces may require 2 or 3 times that much pressure to make the tape experience 15 psi.
  
  Ideal application temperature range is 70°F to 100°F (21°C to 38°C). Pressure sensitive adhesives use viscous flow to achieve substrate contact area. Minimum suggested application temperatures:60°F (15°C): 3M™ VHB™ Tapes 4941, 4945 families.
  
  Note: Initial tape application to surfaces at temperatures below these suggested minimums is not recommended because the adhesive becomes too firm to adhere readily. However, once properly applied, low temperature holding is generally satisfactory.
3. Curing
  
  After application, the bond strength will increase as the adhesive flows onto the surface (also referred to as “wet out”). At room temperature approximately 50% of ultimate bond strength will be achieved after 20 minutes, 90% after 24 hours and 100% after 72 hours. This flow is faster at higher temperatures and slower at lower temperatures. Ultimate bond strength can be achieved more quickly (and in some cases bond strength can be increased) by exposure of the bond to elevated temperatures (e.g. 150°F [66°C] for 1 hour). This can provide better adhesive wetout onto the substrates. Abrasion of the surfaces or the use of primers/ adhesion promoters can also have the effect of increasing bond strength and achieving ultimate bond strength more quickly.
Comparable Materials for 3M 4941

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Spec Engine^® Results
- 4956F(3M)
  • Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C
- 4941F(3M)
  • Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C
- 4936F(3M)
  • Gray, closed-cell acrylic foam carrier • Conformable • Good adhesion to many painted metals • Plasticizer resistant • UL 746C
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